G04C 21/12
By electro-acoustic means
Official title: by electro-acoustic means
G04C21/12 (By electro-acoustic means) appears on 21 US grants and 13 published applications in this corpus.
Search patents in G04C- Granted patents
- 21
- Published applications
- 13
- Assignees
- 9
- Inventors
- 25
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 2 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 2 | 2 |
| 2015 | 2 | 0 |
| 2016 | 1 | 2 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 1 |
| 2021 | 1 | 2 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Clock device with automatic simulation of sunrise or sunset24 Mar 2026US 12,585,227 B2Lutron Technology Company LLC
- Clock device with automatic simulation of sunrise or sunset14 Mar 2023US 11,604,438 B2Lutron Technology Company LLC
- Audible wrist watch assembly25 Oct 2022US 11,480,929 B2
- Audible wristwatch assembly28 Dec 2021US 11,209,782 B2
- Clock device with automatic simulation of sunrise or sunset4 Aug 2020US 10,732,575 B2Lutron Technology Company LLC
- Clock Device with Automatic Simulation of Sunrise or Suset2 Jul 2026US 2026/0186448 A1Lutron Technology Company LLC
- Clock Device with Automatic Simulation of Sunrise or Suset6 Jul 2023US 2023/0213892 A1Lutron Technology Company LLC
- Audible Wrist Watch Assembly20 May 2021US 2021/0149346 A1
- Clock Device with Automatic Simulation of Sunrise or Suset21 Jan 2021US 2021/0018877 A1Lutron Technology Company LLC
- Audible Wristwatch Assembly6 Aug 2020US 2020/0249634 A1
Most cited
By later US patents
- Chronograph assembly12US 9,164,490 B12015
- Device for stopping the striking of a clock at night6US 4,396,297 ARhythm Watch Co., Ltd. · 1983
- Electromechanical clock6US 4,482,260 AKieninger & Obergfell · 1984
- Audible wristwatch assembly5US 11,209,782 B22021
- Vocal reporting device for pointer type timers with accumulative timing transformation5US 5,239,523 A1993